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CINEMA EOS LENSES
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Studying how each of these lenses convoluted with the Canon CMOS image sensor and allied Canon CFA helped establish overall color reproduction benchmarks that guided the subsequent exploration of the new Canon cinema lens spectral response. Video processing – in the form of the digital linear matricing system – was also optimized. The judgment of color balance was made by Canon color scientists in concert with invited directors of photography studying the simulated imagery.
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4k LENS
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The former is the most difficult to contend with in optical design and is a consequence of each wavelength of light having a different magnification. The image sensor in the camera can read this as misregistration between the various wavelengths which can cause color fringing on image transitions, and when added to the four monochromatic aberrations, this constitutes what are collectively called the aggregate defocusing distortions that impair lens MTF – especially at the wider aperture settings (shown for a hypothetical 4K lens in Figure 11).
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White Paper - Personality of the Canon Cinema EOS Lens: Color Reproduction
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Canon Sumire Prime Demo Reel
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Cinematographer Matt Porwoll shows off the beautiful look of Canon's new Sumire Prime lenses in this demo footage. The seven new lenses in the Sumire (pronounced 'Soo-mee-ray') Prime series provide smooth skin tones, gentle focus fall-off and the same warm color science consistent with all Canon cinema lenses.
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CINEMA EOS LENSES
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1. Constant Optical Speed between lenses (if possible) 2. Constant Color Reproduction (precise color matching) 3. Constant Sharpness (and higher sharpness than traditional zooms) 4. Minimum Flare and Ghosting A very specific design goal for the Cinema EOS cine zoom lenses was to achieve an overall optical performance that would equate with the best of contemporary prime lenses and to maintain that performance over their respective focal lengths. Achieving these goals imparts an unusual element to the performance “personality” of these lenses.
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CINEMA EOS LENSES
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Discourses on lens “personality” are probably best done at a bar because the conversation can sometimes become lengthy and, at times, convoluted. One certainly does regularly hear about the importance of optical artifacts and aberrations in imparting a certain desired look for some specific scenes. At the same time, one also hears of the enduring importance of sharpness, contrast, color reproduction and other core attributes of high quality imagery.
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CINEMA EOS LENSES
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As discussed in our last Session #3 – the spectral transmittance of a lens is shaped to achieve a desired color reproduction in association with the digital cine camera. That transmittance characteristic defines the optical signal transmittance efficiency at each wavelength.
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